7975890 has 96 divisors (see below), whose sum is σ = 23705136. Its totient is φ = 1843200.

The previous prime is 7975889. The next prime is 7975921. The reversal of 7975890 is 985797.

It can be written as a sum of positive squares in 8 ways, for example, as 5716881 + 2259009 = 2391^2 + 1503^2 .

It is a super-2 number, since 2×7975890² = 127229642584200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19690 + ... + 20090.

Almost surely, 2^7975890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7975890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11852568).

7975890 is an abundant number, since it is smaller than the sum of its proper divisors (15729246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7975890 is a wasteful number, since it uses less digits than its factorization.

7975890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 7975890 is about 2824.1618225590. The cubic root of 7975890 is about 199.7988811572.

The spelling of 7975890 in words is "seven million, nine hundred seventy-five thousand, eight hundred ninety".